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KMID : 1146620220110030085
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Journal of Korean Academy of Advanced General Dentistry
2022 Volume.11 No. 3 p.85 ~ p.94
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CBCT Assessment of the Proximity of Maxillary Posterior Teeth to the Maxillary Sinus and Cortical Plate Thickness in Elderly Korean Population
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Kim Seong-Eun
Kim Ran-Ah
Kim Sun-Ho
Kim Jeong-Hee
Kim Mi-Yeon
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Abstract
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Cone-beam computed tomography (CBCT) can provide high resolution images and three-dimensional (3D) volumetric data. It can be used as a reliable diagnostic tool to evaluate tooth morphology and relationship of teeth with surrounding anatomical structures. Many previous studies indicate that the age of the subject had a significant effect on alveolar bone resorption. Alveolar bone resorption can cause severe dental problems to patients, especially to the elderly population. The aim of this study is to evaluate the anatomical relationships of maxillary posterior roots to the maxillary sinus and cortical plates in elderly Korean population using cone-beam computed tomographic (CBCT) images. CBCT images of 1906 patients who visited the VHS medical center dental hospital from January 2020 to August 2020 were retrospectively analyzed in this study. A total of 3909 teeth (2355 maxillary second premolars, 1554 maxillary first molars) were examined. Anatomical relationships of maxillary second premolars and first molars were studied by measuring the distance from each root apex to the sinus floor and to cortical plates using CBCT images in both sagittal and coronal planes. The variables were expressed as mean values±standard deviation. The independent samples were analyzed using the t-test (p<0.05). The majority of maxillary second premolars had single root (95%), and the remaining 5% of second premolars had two separate roots. There was one maxillary second premolar presented an accessory root. Similarly, 99% of maxillary first molars had three separate roots, and only 1% of first molars presented an accessory root. The mean distances from root apex to the sinus floor were shorter in maxillary first molars (3.74 to 4.43 mm) than second premolars (4.60 to 5.07 mm). The frequency of a root protrusion into the maxillary sinus was high in palatal roots of maxillary first molars than other roots. In terms of cortical plate thickness, maxillary second premolars had thicker cortical plates than maxillary first molars. The mean distances from root apex to the sinus floor were shorter in maxillary first molars than second premolars. The frequency of a root protrusion into the maxillary sinus was high in palatal roots of maxillary first molars than other roots. In terms of cortical plate thickness, maxillary second premolars had thicker cortical plates than maxillary first molars. Knowledge of approximate values of cortical bone thickness and distance to the sinus floor could help clinicians to avoid iatrogenic damage during conventional and surgical endodontic treatments.
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KEYWORD
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Cone-beam computed tomography, Maxillary sinus floor, Root protrusion, Cortical bone thickness, Maxillary second premolars, Maxillary first molars
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